@ng01: "What does this mean?  That it filters *only* the most prevalent?
This is what help says:
"Enable Rapid E-Mail Attachment Filtering - Select this feature to
automatically block the most prevalent e-mail viruses on the current Rapid
E-mail Attachment Block List."
Reply in group, but if emailing add
2 more zeros and remove the obvious."
    @art: "<quote>
That would depend on the context.  If found on a configuration screen, I
would assume there would be either radio buttons or checkboxes.  If the
former, yes; if the latter, no.
Based on the text alone, I would say no, due to the word "Enable".  If
it had been an exclusive choice, the word "Use" would have been better.
Then again, instructions for these things seem to be written by people
with neither technical nor English language skills[1], so it's hard to
be certain.
[1]:  Malapropos the original post, but I find the Symantec Gateway
Security devices to have an interface that surely must confuse new user.
One example is "Special Applications" (port triggering).  What's called
"Redirect to Port(s)" on the configuration screen and "Incoming Port(s)"
on the help screen are neither.  That's the outgoing trigger ports.  How
are users supposed to figure this out?
Regards,
*Art"
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